Untitled

const fA = () => console.log("A");

const fB = () => console.log("B");

const fC = () => console.log("C");

const fD = () => {
    console.log("Start");
    setTimeout(fA, 0);

    setTimeout(fB, 0);
    new Promise((resolve, reject) => {
        resolve("B1");
    }).then((resolve) => {
        console.log(resolve);
        setTimeout(() => {
            console.log("B2");
        }, 0);
    });

    new Promise((resolve, reject) => resolve("B3")).then((resolve) => {
        console.log(resolve);
    });

    fC();
};
fD();